We should set up a EG Group and see what classes/abillities different people want, and maybe orginize squads. As already mentioned tacticians are very important but we don't need more than enough to place clever spawns. Engineers and medics are more usefull when we have enough tacticians.
Scouts are good for bodycount, sabotaurs(attacking) and medics(defending and reviving the target) for assassination, and assault for S&R.